Simulation Model to Assess the Water Dynamics in Small Reservoirs

Alisson Lopes Rodrigues (), Lineu Neiva Rodrigues, Guilherme Fernandes Marques and Pedro Manuel Villa
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Alisson Lopes Rodrigues: Federal University of Viçosa (UFV)
Lineu Neiva Rodrigues: Embrapa Cerrados
Guilherme Fernandes Marques: Hydraulic Research Institute, Federal University of Rio Grande Do Sul (UFRGS)
Pedro Manuel Villa: State University of Feira de Santana (UEFS)

Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), 2023, vol. 37, issue 5, No 11, 2019-2038

Abstract: Abstract Small reservoirs play a key role in agricultural development in the Brazilian Savannah (Cerrado) region. They contribute to diminishing rural communities’ vulnerability to drought and improve the livelihood of rural populations. Thousands of small reservoirs have been built in the last few decades in the Cerrado biome; however, efficient water management and sound planning are hindered by inadequate knowledge of their water dynamics. The main objective of this study was to develop a dynamic simulation model (SD) to assess the small reservoir (SR) water dynamics in the Brazilian Cerrado region. Daily data on reservoir inflows were obtained for the period from October 2009 to September 2011, and extended to June 2015 through modeling. The developed model was calibrated and validated with historical data. Sensitivity analysis was applied to assess the main variables that influence the SR water dynamics. The results indicated that reservoir inflow was the variable that had the highest impact on SR water volume, followed by the reservoir surface area and by evaporation and infiltration, which together represented 14.4% of reservoir inflow. Approximately 81.9% of the SR stored water was available to attend to the water demand. The related research findings of this study could be favorable for guiding the reservoir’s construction (optimal size) and management of irrigation and human demand by evaluating different variables and fluxes. This study adopts basic approaches and equations to determine the relationships between variables with observed values and estimated fluxes in a small reservoir, which can be useful to simulate reservoir dynamics, adjust the initial values, or alternatively, simulate climate change scenarios.

Keywords: System dynamic; Sensitivity analysis; Evaporation; Water resources; Reservoir water budget (search for similar items in EconPapers)
Date: 2023
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DOI: 10.1007/s11269-023-03468-2

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